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Now showing items 1-10 of 10

#### Solution of the Gribov problem from gauge invariance

(2008-12-01)

A new approach to gauge fixed Yang-Mills theory is derived using the Polyakov-Susskind projection techniques to build gauge invariant states. In our approach, in contrast to the Faddeev-Popov method, the Gribov problem ...

#### The low-lying baryon spectrum with two dynamical twisted mass fermions

(2009-10-13)

The masses of the low lying baryons are evaluated using two degenerate flavors of twisted mass sea quarks corresponding to pseudo scalar masses in the range of about 270-500 MeV. The strange valence quark mass is tuned to ...

#### Light baryon masses with dynamical twisted mass fermions

(2008-03-21)

We present results on the mass of the nucleon and the Delta using two dynamical degenerate twisted mass quarks and the tree-level Symanzik improved gauge action. The evaluation is performed at four quark masses corresponding ...

#### Probing the ground state in gauge theories

(2007-09-21)

We consider two very different models of the flux tube linking two heavy quarks: a string linking the matter fields and a Coulombic description of two separately gauge invariant charges. We compare how close they are to ...

#### Is the ground state of Yang-Mills theory Coulombic?

(2008-06-06)

We study trial states modelling the heavy quark-antiquark ground state in SU(2) Yang-Mills theory. A state describing the flux tube between quarks as a thin string of glue is found to be a poor description of the continuum ...

#### First results of ETMC simulations with Nf=2+1+1 maximally twisted mass fermions

(2009-11-27)

We present first results from runs performed with Nf=2+1+1 flavours of dynamical twisted mass fermions at maximal twist: a degenerate light doublet and a mass split heavy doublet. An overview of the input parameters and ...

#### Baryon masses with dynamical twisted mass fermions

(2007-10-05)

We present results on the mass of the nucleon and the $\Delta$ using two dynamical degenerate twisted mass quarks. The evaluation is performed at four quark masses corresponding to a pion mass in the range of 690-300 MeV ...

#### Status of ETMC simulations with Nf=2+1+1 twisted mass fermions

(2008-10-21)

We present the status of runs performed in the twisted mass formalism with $N_{\rm f}=2+1+1$ flavours of dynamical fermions: a degenerate light doublet and a mass split heavy doublet. The procedure for tuning to maximal ...

#### Partially quenched study of strange baryon with Nf = 2 twisted mass fermions

(2009-05-18)

We present results on the mass of the baryon octet and decuplet using two flavors of light dynamical twisted mass fermions. The strange quark mass is fixed to its physical value from the kaon sector in a partially quenched ...

#### Nucleon form factors with dynamical twisted mass fermions

(2008-11-05)

The electromagnetic and axial form factors of the nucleon are evaluated in twisted mass QCD with two degenerate flavors of light, dynamical quarks. The axial charge g_A, magnetic moment and the Dirac and Pauli radii are ...